Nipping-shuttle for weaving

ABSTRACT

A weaving shuttle in which a bobbin is removably retained between separable clamping portions and in which the separable portions are retained in clamping relation by a transverse, elastic pin, under tension, the pin extending through co-axial bore portions of the clamping portions and the clamping portions and the bores converging from a mating plane of juxtaposed clamping parts to facilitate introduction of retention heads at opposite ends of the pin; the pin heads having inner annular undercut portions for providing a relief when compressing the pin head through outer ends of the converging bores and cooperating with complimentary seats in enlarged recesses opening into outer sides of the respective clamping parts in which the recesses have a convergent shoulder portion tending to retain the heads in the recesses; the pin being of uniform cross section or having a central enlarged portion, the central enlargement being doubleconsent toward the heads; the central enlargement preventing lateral twisting of the cooperating clamping portions.

llnited States Patent [1 1 Rietzier Sept. 17, 1974 1 NlPPllNG-SIHIUTTLE FOR WEAVING Rudolf Rietzler, Ramsdorf, Germany [75] Inventor:

[22] Filed: Feb. 5, 1973 [21] Appl. No.: 329,829

[30] Foreign Application Priority Data Apr. 25, 1972 Germany 2220232 [52] US. Cl. 139/207 [51] Int. Cl. D03j 5/08 [58] Field of Search 139/207, 206, 196 R, 197

[56] References Cited UNITED STATES PATENTS 1,580,961 4/1926 Cheney 139/207 2,200,213 5/1940 Burdett 139/207 2,643,685 6/1953 Egli 139/207 3,604,473 9/1971 Butikofer 1 139/207 3,750,717 8/1973 Forster 139/207 FOREIGN PATENTS OR APPLICATIONS 300,897 11/1954 Switzerland 139/207 836,030 4/1952 Germany I 1 139/207 3/1964 Great Britain 139/207 7/1950 Great Britain 139/207 Primary Examiner.lames Kee Chi Attorney, Agent, or Firm-Holman & Stern [5 7] ABSTRACT A weaving shuttle in which a bobbin is removably retained between separable clamping portions and in which the separable portions are retained in clamping relation by a transverse, elastic pin, under tension, the pin extending through co-axial bore portions of the clamping portions and the clamping portions and the bores converging from a mating plane of juxtaposed clamping parts to facilitate introduction of retention heads at opposite ends of the pin; the pin heads having inner annular undercut portions for providing a relief when compressing the pin head through outer ends of the converging bores and cooperating with complimentary seats in enlarged recesses opening into outer sides of the respective clamping parts in which the recesses have a convergent shoulder portion tending to retain the heads in the recesses; the pin being of uniform cross section or having a central enlarged portion, the central enlargement being double-consent toward the heads; the central enlargement preventing lateral twisting of the cooperating clamping portions.

6 Claims, 4 Drawing Figures NIPPING-SHUTTLE FOR WEAVING BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates generally to weaving shuttles, and more particularly to nipping or clamping shuttles including improved means for retaining clamping parts in clamped relation.

2. Description of Prior Art The invention relates to a nipping shuttle of the character disclosed in US. Letters Pat. to BUTIKOFER No. 3,604,473 issued Sept. 13, 1971, for example, and details as to conventional shuttle structure are incorporated in the present application by reference.

As is apparent from a consideration of the Butikofer patent, for example, the separable clamping portions are normally urged toward each other by a headed retention pin extending through co-axial bores and retaining sleeves may be utilized in recesses accommodating the pin heads.

SUMMARY OF THE INVENTION The present invention comprises an elastic retention pin of rubber or a comparable material for clamping parts of a weaving shuttle which eliminates the necessity for using pin-head seating collars, includes means for positively retaining the parts together, and which these parts facilitate assembly of the retention pin between the clamping parts; more particularly, the retaining pin-heads include an undercut or relief accommodated in correspondingly formed seats opening into opposed outer side walls of the clamped parts, and tension of the elastic pin tending to drawn the parts together, and collapsing of the heads is counteracted by the relief portions which tend to expand in their seats to obviate accidental separation on disassembly of the parts; an other feature of the invention is to provide a construction and arrangement in which lateral twisting of the clamping part is prevented and the necessity for special guiding structure, which is subject to stress, strain, wear and fracture after continued use is eliminated, and also eliminating the necessity for machining or forming special projecting guides which are subject to wear and strain as well as complicating the assembly and construction of the cooperating shuttle parts; the expedient to prevent relative lateral twisting comprising an enlargement or double-conical formation on the retention pin having undercut heads in which the enlargements cooperate with correspondingly shaped bore portions in axial alignment through the clamping parts of the shuttle; and which retains all of the advantages of ease of assembly, etc.

BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a cross section through the portion of the clamping portions of a clamping shuttle illustrating the novel structure of one embodiment of the invention;

FIG. 2 is a longitudinal cross section of the elastic pin used in the invention, incorporating the assembly tabs;

FIG. 3 is a section similar to FIG. 1 showing another embodiment of the invention; and

FIG. 4 is a longitudinal cross section similar to FIG. 2, and showing the elastic pin of FIG. 3 with assembly tabs incorporated thereon.

DESCRIPTION OF PREFERRED EMBODIMENTS It is understood that the weaving shuttle of the invention generally has the construction and function of that disclosed in the US. Pat. to Butikofer, No. 3,604,473, for example, used to retain a bobbin by separated side walls as is conventional; see FIG. 1 and explanation of the parts.

The novel structure of the invention is incorporated in the shuttle in the general area shown in FIG. 2 of the issued patent; further explanation is apparently unnecessary for those skilled in the art.

In FIG. 1, the cooperating portions of a clamping shuttle are urged towards each other at a mating plane 4 by means of an elastic pin. The pin includes a cylindrical center or stem 3, terminating at opposite ends in enlarged head 6 and 7. The heads 6 and 7 respectively include undercut frust-conical surfaces 6a or 7a which abut at respective correspondingly undercut surfaces lc or 20 of recesses lb or 2b opening into the opposite sides of the clamping shuttle portions 1 or 2. The length of the center part or stem 3 of the pin, when said pin is in a relieved condition, is somewhat shorter than the distance between the surfaces 1c and 2c and as a result thereof, the portions 1 and 2 of the clamping shuttle are pulled towards each other by means of the tensioned pin. The borehole la or 2a of the clamping shuttle portions 1 and 2 is somewhat conical and converges outwardly.

FIG. 2 illustrates the pin being provided, at its heads 6 and 7, with axial extensions 8 or 9 (before it is inserted into the shuttle bore) in which the diameter of the axial extensions are approximately of the same size as the diameter of the center section 3.

In order to insert the pin into bore of the clamping shuttle, the sections 1 and 2 of the clamping shuttle are spaced apart from each other to an extent that the extension 8 of the pin can be inserted from the surface 4 through the borehole la into the clamping shuttle section 1. Thereafter, the extension 8 can be gripped with a plier or gripper and the pin is pulled outwardly through the borehole la so that the head 6 enters the recess 1b. The deformation of the head 6, required for this purpose, is possible by means of the undercut 6a.

Thereafter, the extension 8 is inserted into the borehole 2a of the clamping shuttle section 3 from the direction of the plane 4, and the extension 9, which protrudes from the recess 2b, is pulled outwardly by means of a gripper so that the head 7 is moved into the recess 2b. The pin is thus placed, under tension, into the position shown in FIG. 1. The extensions 8 and 9 are then cut off to such a length that the heads will not extend beyond the outersurface of portions 1 and 2 of the clamping shuttle. Preferably, they are cut off to such an extent so that their upper surface lies somewhat below the outer surface of the clamping shuttle, see FIG. 1.

The heads 6 and 7 with stem 3 secure the shuttle portions 1 and 2 in position; due to tension of the pin applied at their undercut surfaces 6a and 7a engaging on the undercut surfaces 1c or 20, of parts 1 and 2, their cylindrical outer surface abuts against the cylindrical wall of recesses lb or 2b. The co-axial bores la, lb which converge outwardly assist in collapsing the respective heads as they are pulled into recesses 1c, 2c. Attempts to pull portions 1, 2 apart, results in the application of a bending force at the juncture of the heads 6, 7 at their connection with stem 3 securely jambing the head into their accommodating recesses. The undercut portions 6a, 7a of the heads permit the heads 6, 7 to be collapsed through bores la, 2a into recesses 1c, 20, respectively.

Briefly, there has been disclosed clamping parts of a nipping shuttle in which undercut retention heads of an elastic pin of rubber or any other suitable material, are received in mirror"-shaped recesses at the ends of coaxial tapered bores of the parts retained together; the tapered bores guide the heads while they are compressed during installation, and axial projections (subsequently removed) facilitate assembly or installation of the pins in the clamp parts of the shuttle. The elastic pin heads, after being installed, and while tension is applied to the heads, tend to be deformed into jambed relation in their accommodating recesses and accordingly the pin is firmly retained in its assembled relationship.

Similarly functioning parts of the embodiment of FIGS. 3 and 4 are identified with the same numerals applied in FIGS. 1 and 2. The clamping shuttle comprises: two shuttle-portions l and 2, which are drawn towards each other at their mating surfaces 4 by means of a pin consisting of a suitable elastic material. The pin comprises a center section 3' integral with heads 6, 7 at its opposite ends. The heads 6, 7 include undercut surfaces 6a, 7a, and abut respective undercut surfaces 1c, 2c of recesses 1b, 2b of the clamping shuttle portions 1, 2.

The length of the center section 3 of the pin, when the pin is not under tension, is somewhat shorter than the distance between the surfaces 10 and 2c of the shuttle parts. As a result thereof, the clamping shuttle sections 1, 2 of the shuttle are drawn towards each other by the pin. The boreholes la, 2a of the clamping shuttle sections 1, 2 are slightly conical in shape, tapering or converging outwardly from the mating surface.

The center sections 3 of the pin include a contral bulge or enlarged medial diameter. By means of this bulge, the center section 3' of the pin abuts the walls of the co-axial boreholes 1a, 20, especially adjacent the edges in the area of the mating surface 4. This guarantees that the two shuttle sections 1, 2 cannot be laterally displaced relative to one another. In the preferred embodiment as shown in the drawing, the bulge is a double-cone. The double-cone has a mutual base which abuts at mating surface 4 of the shuttle sections 1, 2. The dimensions of the double-cone are such that they correspond substantially to the size of the co-axial conical boreholes la, 2a. The double-cone abuts along its entire surface to the joined shuttle sections 1, 2, via the wall of the conical boreholes la, 2a.

The particular function and special advantage of the instant invention resides in the simple construction of the pin and its guiding function relative to the two clamping shuttle sections 1, 2. The guiding is insured by means of the enlarged center section of the pin 3. Additional guide means, as required in prior art clamping shuttles, are not necessary. The conical shape of the center section 3 provides a very effective guiding means. Also, during extensive use of the clamping shuttle, a long service life of the pin is guaranteed since it is not under great stress because of its positioning inside the boreholes and the manner in which it is being guided, i.e., in comparison with prior art guide means consisting of rubberized plugs, for example.

The embodiment of FIGS. 3 and 4, eliminates the necessity for specially constructed boss-and-notches in the mating shuttle parts which are subject to breakage over constant usage; further, the retention pin eliminates the necessity for the use of special rubber guide plugs and/or the formation of cooperating recesses and domes on the mating parts, i.e., parts which are subject to friction and/or excessive wear. The improvement of FIGS. 3 and 4 not only incorporates the advantages of the embodiment of FIGS. 1 and 2, but provides an additional guiding function preventing relative lateral displacement of the mating shuttle parts.

Although the bulge in FIGS. 3 and 4 is shown as being double-conical, the essential criteria of this guiding function of stemm 3 is that it cooperates at the mating plane 4 of the parts whereby substantially lateral displacement of the clamping parts is substantially eliminated when changing spools or bobbins.

What is claimed is:

1. In a weaving shuttle including a pair of juxtaposed clamp portions; and elastic means extending between said portions and normally drawing the shuttle portions together, said clamp portions including co-axial bore portions terminating in outer, enlarged recesses, the co-axial bore portions intersecting a mating surface of the juxtaposed shuttle portions, said elastic means comprising a pin having a stem extending through said coaxial bore portions and including terminal, integral, enlarged retention heads seated in respective ones of said enlarged recesses and retained thereat, the improvement in which said retention heads include an inner undercut portion adjacent of the stem, and the enlarged recesses of the shuttle portions include substantially complimentary undercut portions at the junction thereof with said co-axial bore portions of the shuttle portions.

2. The structure as claimed in claim 1 in which the co-axial bore portions of said shuttle portions converge from the mating surface of said shuttle portions.

3. The structure as claimed in claim 1 in which said retention heads include a severable, axial extension of a smaller cross section than said retention heads for facilitating introductions of the pin in said co-axial bore portions, the extension having a length substantially equal to the length of the stem of said pin.

4. The structure as claimed in claim 1 in which said pin stem included a central enlargement substantially equal to the cross sections of said co-axial bore portions.

5. The structure as claimed in claim 4 in which said central enlargement abuts adjacent the end of said coaxial bore portions at said juxtaposed mating surfaces.

6. The structure as claimed in claim 1 in which said co-axial bore portions of the respective shuttle portions are conical and converge toward said enlarged recesses, said pin stem being a double-conical construction substantially complementary to said co-axial bore portions and having a base disposed substantially at the juxtaposed mating surface of said shuttle portions.

- STATES PATENT OFFICE @ERKFECATE @F ECTMWQ Patent No. 3,835,877 Dated September 17, 1974 55. Inventor Sm Rudolf Rietz ler .It is certified that error appears in the above-identified patent and that .said Letters Patent are hereby corrected as shown below:

{30] Foreign Priority Data:

Germany No. P2205 348.3. February 4, 1972 Signed m seared this 18th day of February 1975.

(SEAL) Attest: I

I i C. MARSHALL DANN RUTH C. MASON Commissioner of Patents Arresting Officer and Trademarks mam 

1. In a weaving shuttle including a pair of juxtaposed clamp portions; and elastic means extending between said portions and normally drawing the shuttle portions together, said clamp portions including co-axial bore portions terminating in outer, enlarged recesses, the co-axial bore portions intersecting a mating surface of the juxtaposed shuttle portions, said elastic means comprising a pin having a stem extending through said coaxial bore portions and including terminal, integral, enlarged retention heads seated in respective ones of said enlarged recesses and retained thereat, the improvement in which said retention heads include an inner undercut portion adjacent of the stem, and the enlarged recesses of the shuttle portions include substantially complimentary undercut portions at the junction thereof with said co-axial bore portions of the shuttle portions.
 2. The structure as claimed in claim 1 in which the co-axial bore portions of said shuttle portions converge from the mating surface of said shuttle portions.
 3. The structure as claimed in claim 1 in which said retention heads include a severable, axial extension of a smaller cross section than said retention heads for facilitating introductions of the pin in said co-axial bore portions, the extension having a length substantially equal to the length of the stem of said pin.
 4. The structure as claimed in claim 1 in which said pin stem included a central enlargement substantially equal to the cross sections of said co-axial bore portions.
 5. The structure as claimed in claim 4 in which said central enlargement abuts adjacent the end of said co-axial bore portions at said juxtaposed mating surfaces.
 6. The structure as claimed in claim 1 in which said co-axial bore portions of the respective shuttle portions are conical and converge toward said enlarged recesses, said pin stem being a double-conical construction substantially complementary to said co-axial bore portions and having a base disposed substantially at the juxtaposed mating surface of said shuttle portions. 